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TI-2026-15970 Aliases CVE-2026-19671GHSA-3wrw-4pcx-6p2g

Improper handling of highly compressed data (data amplification) in CISA Malcolm

Priority MEDIUM 64CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces entry-count, nesting-depth, and total-uncompressed-byte limits when extracting container archives (zip/tar/rar/7z via libarchive), but those limits are not applied when the uploaded file is a single-stream compressed format (.gz, .bz2, .xz, .lzma, .lz) that isn't a .tar.*-style archive. Any authenticated user permitted to upload PCAP/log files can upload a small, highly compressible file (e.g. a gzip bomb) that decompresses to an effectively unbounded size on disk, exhausting the shared Docker volume used by OpenSearch, Logstash, Arkime, and Zeek, and disrupting the platform for all users.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00436 38th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cisagovMalcolmup to 26.07.1—No fix listedCNA
  • Malcolm Vendorcisagov Affected up to 26.07.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-19671
  2. 2026-10-03 Alias added: GHSA-3wrw-4pcx-6p2g

References

Other 2

  • TI-2026-45069 Malcolm has Uncontrolled Resource Consumption in Archive Extraction (Inode-Exhaustion DoS) CVSS 4.0HIGH 7.1
  • TI-2026-45070 Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation CVSS 4.0MEDIUM 5.3
  • TI-2026-15969 Incorrect Authorization in CISA Malcolm CVSS 4.0MEDIUM 5.3
  • TI-2026-40197 Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component CVSS 4.0HIGH 8.7
  • TI-2026-45083 Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences